diff -rauN arrayfire-full-3.6.0/test/CMakeLists.txt arrayfire-full-3.6.0-no-cuda-backend-testing-patch/test/CMakeLists.txt
--- arrayfire-full-3.6.0/test/CMakeLists.txt	2018-05-02 20:53:08.000000000 +0200
+++ arrayfire-full-3.6.0-no-cuda-backend-testing-patch/test/CMakeLists.txt	2018-05-26 17:23:02.097495405 +0200
@@ -49,9 +49,9 @@
   list(APPEND enabled_backends "cuda")
 endif(AF_BUILD_CUDA)
 
-if(AF_BUILD_OPENCL)
-  list(APPEND enabled_backends "opencl")
-endif(AF_BUILD_OPENCL)
+#if(AF_BUILD_OPENCL)
+#  list(APPEND enabled_backends "opencl")
+#endif(AF_BUILD_OPENCL)
 
 if(AF_BUILD_UNIFIED)
   list(APPEND enabled_backends "unified")